Coherence resonance in a single-walled carbon nanotube ion channel.

Citation data:

Science (New York, N.Y.), ISSN: 1095-9203, Vol: 329, Issue: 5997, Page: 1320-4

Publication Year:
2010
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Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/12309
PMID:
20829480
DOI:
10.1126/science.1193383
Author(s):
Lee, Chang Young, Choi, Wonjoon, Han, Jae-Hee, Strano, Michael S.
Publisher(s):
American Association for the Advancement of Science (AAAS), AMER ASSOC ADVANCEMENT SCIENCE
Tags:
Multidisciplinary, STOCHASTIC RESONANCE, MEMBRANE PATCHES, SURFACE-CHARGE, K+ CHANNEL, NOISE, TRANSPORT, WATER, TRANSLOCATION, COORDINATION, ENHANCEMENT
article description
Biological ion channels are able to generate coherent and oscillatory signals from intrinsically noisy and stochastic components for ultrasensitive discrimination with the use of stochastic resonance, a concept not yet demonstrated in human-made analogs. We show that a single-walled carbon nanotube demonstrates oscillations in electroosmotic current through its interior at specific ranges of electric field that are the signatures of coherence resonance. Stochastic pore blocking is observed when individual cations partition into the nanotube obstructing an otherwise stable proton current. The observed oscillations occur because of coupling between pore blocking and a proton-diffusion limitation at the pore mouth. The result illustrates how simple ionic transport can generate coherent waveforms within an inherently noisy environment and points to new types of nanoreactors, sensors, and nanofluidic channels based on this platform.

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